czlonkowski n8n-mcp up to 2.47.12 n8n_manage_credentials log file

Summaryinfo

A vulnerability described as problematic has been identified in czlonkowski n8n-mcp up to 2.47.12. This vulnerability affects the function n8n_manage_credentials. Executing a manipulation can lead to log file. This vulnerability is tracked as CVE-2026-42282. The attack can be launched remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic was found in czlonkowski n8n-mcp up to 2.47.12. This vulnerability affects the function n8n_manage_credentials. The manipulation with an unknown input leads to a log file vulnerability. The CWE definition for the vulnerability is CWE-532. Information written to log files can be of a sensitive nature and give valuable guidance to an attacker or expose sensitive user information. As an impact it is known to affect confidentiality. CVE summarizes:

n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to version 2.47.13, when n8n-mcp runs in HTTP transport mode, authenticated MCP tools/call requests had their full arguments and JSON-RPC params written to server logs by the request dispatcher and several sibling code paths before any redaction. When a tool call carries credential material — most notably n8n_manage_credentials.data — the raw values can be persisted in logs. In deployments where logs are collected, forwarded to external systems, or viewable outside the request trust boundary (shared log storage, SIEM pipelines, support/ops access), this can result in disclosure of: bearer tokens and OAuth credentials sent through n8n_manage_credentials, per-tenant API keys and webhook auth headers embedded in tool arguments, arbitrary secret-bearing payloads passed to any MCP tool. The issue requires authentication (AUTH_TOKEN accepted by the server), so unauthenticated callers cannot trigger it; the runtime exposure is also reduced by an existing console-silencing layer in HTTP mode, but that layer is fragile and the values are still constructed and passed into the logger. This issue has been patched in version 2.47.13.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-42282 since 04/26/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.

Upgrading to version 2.47.13 eliminates this vulnerability.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• czlonkowski

Name

• n8n-mcp

Version

• 2.47.0
• 2.47.1
• 2.47.2
• 2.47.3
• 2.47.4
• 2.47.5
• 2.47.6
• 2.47.7
• 2.47.8
• 2.47.9
• 2.47.10
• 2.47.11
• 2.47.12

Website

• Product: https://github.com/czlonkowski/n8n-mcp/

CPE 2.3info

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CPE 2.2info

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